The Kyoto protocol was an agreement led by the United Nations and signed by different countries on reducing their carbon emission to preserve the environment. The legal agreement stated that they would have to reduce greenhouse gas emissions by 5.2% to reduce effects of global warming.
They joined forces with the French
There was always the possibilities that: Someone would have more than one vote or not vote at all, the voter may not be as anonymous, the vote could not be fully accurate in any way, and in person there would be the less possibility of a fraud then their could through the internet. Hope this helps!